Formula Design And Performance Study Of Off The Road Tire Tread

With the rapid development of the mining industry and automobile transportation industry,people use engineering vehicles more and more frequently,and the working environment faced by engineering vehicles is extremely complex,so the corresponding performance requirements for the off the road tire are gradually harsh..The more stringent.However,the choice of rubber materials and the formulation design of off the road tire tread are closely related to the improvement of the abrasion resistance,heat build-up,rolling resistance and fatigue performance.The new synthetic high-trans-butadiene-isoprene copolymer rubber(TBIR),combined with natural rubber(NR),solution polymerized styrene butadiene rubber(SSBR),etc.,can significantly improve the physical and mechanical properties of the blended vulcanizate,especially effectively reducing rolling resistance and abrasion,and significantly improving fatigue.It is a new type of synthetic rubber with the development of green tires.In this paper,the off the road tire tread rubber formula is the basic formula,through the combined part of the TBIR rubber and the local adjustment of the formula,the structure and performance of the blended rubber are studied,and the off the road tire tread with high abrasion resistance,low heat build-up,low hysteresis and excellent fatigue performance is developed.The research content of this work includes:(1)The structure and properties of NR/ESBR/TBIR blends were studied.Using atomic force microscope,transmission electron microscope,equilibrium swelling method and chemical probe method,we study the aggregated structure,filler dispersion,cross-linking density and cross-linking bond of compound rubber,and it was found that TBIR crystal fiber structure existed in the NR/ESBR compound rubber.This crystal fiber structure can enhance the strength and modulus of the NR/ESBR compound rubber,and helpful to improve filler dispersion.The NR/ESBR vulcanizates displays excellent wear resistance,low heat build-up,and excellent fatigue resistance.We analysised the effects of aggregated structure and cross-linked structure on the properties of ternary system vulcanizates.(2)The structure and properties of NR/TBIR blends were studied.The study found that TBIR increased the polysulfide bond density of the NR/TBIR system.With the increasing of the amount of TBIR,the hardness and modulus of the NR/TBIR rubber compound increase significantly,and the binder content of the rubber compound increases,indicating that the interaction between the rubber and the filler is enhanced;the wear resistance of the NR/TBIR vulcanizate Increase,the wear volume is significantly reduced,hysteresis is reduced,heat generation is reduced,and fatigue performance is significantly improved.(3)The structure and properties of unfilled NR/TBIR blends were studied.The results was show that,compared with NR,the Green strength,elongation stress and Mooney of NR/TBIR=90/10 blends are significantly increased,t₁₀is prolonged,t₉₀is shortened,and the processing safety performance is improved.Compared with contrast rubber,the crosslink density of the unfilled NR/TBIR=90/10 vulcanizate at30°C is lower rubber,and the crosslink density after fatigued at 60°C and 90°C is higher.The increase in crosslink density and polysulfide bond density will be helpful to improve the fatigue performance of combined vulcanizates.